sorry, here's a question for those pondering the difference of Gen 3 and 505.

Do these differences come out for graphics/illustrations that appear within an ebook?

Also, I'm still confused about mobipocket's support of jpgs. Their forum said that 64K is the maximum size, and that jpeg support must be manually checked on the Creator program for it to work. the cybook people said that they did support the hirsc attribute.

sorry, here's a question for those pondering the difference of Gen 3 and 505.

Do these differences come out for graphics/illustrations that appear within an ebook?

In the "real world" there is little - if any - practical difference. Both devices "dither" images so effectively that you really wouldn't know how many grey scales they support. Think of newspaper pictures; they are made up of only black dots and white space, and yet dithering gives the effect of multiple shades of grey. These readers display images the same way.

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Also, I'm still confused about mobipocket's support of jpgs. Their forum said that 64K is the maximum size, and that jpeg support must be manually checked on the Creator program for it to work. the cybook people said that they did support the hirsc attribute.

Again you really don't have to worry about it. Let the book creation software do it all for you. There's certainly no size limit on the how large an image can be displayed in a book.

I'm with HarryT. I have a 505 and a Gen3. The displays are very similar to me. In natural light the Gen3 looks "whiter". Pictures look great on both. I'm no expert - this is just my impressions/feelings. Nothing scientific <g>.

Sorry the picture didn't come out very good, I'll try to take better pictures if the sun is out tomorrow. I only have the CyBOOK so can't do side by side comparison.

I tried to get two different lighting conditions.

That would answer the question of quality. It seems that the image really has only 4 levels of gray instead of the 16 that I thought it had. There is another image with 16 distinct levels that may tell us more. I will find it and post it.

Do these differences come out for graphics/illustrations that appear within an ebook?

Also, I'm still confused about mobipocket's support of jpgs. Their forum said that 64K is the maximum size, and that jpeg support must be manually checked on the Creator program for it to work. the cybook people said that they did support the hirsc attribute.

See Images in MobiPocket. Post #16 is the most relevant, and includes a link to a previous thread on a similar topic.

The vast majority of existing MOBI books have GIF images, and the typical color image reaches 64KB using GIF at a very small size (perhaps 300x300). So MOBI books have small images (smaller than other formats). This has nothing to do with the "hisrc" tag, which is still limited to 64KB per image. If you produce your own MOBI books using JPEG images, this problem largely goes away. For example, rather than using the original MOBI version, I download the DRM-free LIT version of multi-format e-books that include illustrations and then convert them to MOBI using ConvertLIT and mobigen.exe (-jpeg) to get larger images.

That would answer the question of quality. It seems that the image really has only 4 levels of gray instead of the 16 that I thought it had. There is another image with 16 distinct levels that may tell us more. I will find it and post it.

Dale

Here is the 16 level gray sheet for use in checking picture quality difference. How many come through and how to they look?

If this is like an earlier 16-level version, it will only show 15 levels on the iLiad - presumably because one of the near-white levels is different in its table than in this image. I found that a continuous grey shade image (from a post by IceHand) provided a better indication of the available gray levels.